What are tag/word clouds?

Tag clouds (or ‘word clouds’) are visualizations made up of sets of words from a document, website or set of ‘tags’ (ex: bookmarks from your del.icio.us account). These word collections may use color, word size or even position to better illustrate the frequency of word use. A popular example of word clouds in action would be the recent use of word clouds to analyze presidential speeches. Here’s a screenshot of Chirag Mehta’s tool that creates a word cloud for several presidential speeches:

This cloud reveals the most 50 most frequently used words in Bush’s 2007 State of the Union Address. The standout terms are obvious. The thing that makes Mehta’s tool really interesting, is that he’s included a ’slider’ (look above the word cloud box) that can be moved to cycle through word clouds from other speeches from the past. Here’s one of Harry Truman’s State of the Union Address speeches:

How Can You Use or Create Tag/Word Clouds?

Several great tools for visualizing text and tags exist on the web. For analyzing del.icio.us tags, extisp.icio.us or the tag tool at Hub Log work just fine. Another popular tool, Tag Crowd, takes things a step further than just sorting del.ico.us tags, and allows users to copy/paste text from documents or even analyze a webpage. Here’s the CIT Strategic Plan for 2008-2011 copy/pasted into Tag Crowd, then filtered down to the 50 most frequently used terms:

Not surprisingly, ‘teaching’, ‘technology’, and ‘faculty’ come up quite a bit. This works well enough, but what if I want to make this look, er…pretty? That’s where Wordle comes in. Here’s the same text from the Strategic Plan pushed through Wordle:

Now, that’s a ‘pretty’ word cloud. Wordle includes several options for enhancing the visualization: multiple font choices, color palettes, and overall layout of the text (ie: horizontal, random, vertical, etc). Wordle creations can be printed out or posted to a public gallery on the web. Here’s another version of the word cloud above, reduced to a frequency of 50 words, with a color palette applied:

This entry was posted on Thursday, July 3rd, 2008 at 10:20 am and is filed under Data manipulation, Images, Teaching with Technology, Technology Trends, Tools, Web2.0. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.